<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>操作元素之修改属性</title>
</head>
<body>
    <button id="ldh">刘德华</button>
    <button id="zxy">张学友</button>
    <img src="images/ldh.jpg" alt="" title="刘德华">
    <script>
        //修改元素属性 src
        //1.获取元素
        var ldh=document.getElementById('ldh');
        var zxy=document.getElementById('zxy');
        var img=document.querySelector('img');
        //注册事件
        zxy.onclick=function(){
            img.src='images/zxy.jpg';
            img.title='张学友';
        }
        ldh.onclick=function(){
            img.src='images/ldh.jpg';
            img.title='刘德华';
        }
    </script>
</body>
</html>